Joe Sears and Jaston Williams have routinely included San Antonio in tours of their Tuna plays, which makes sense: They started writing “Greater Tuna,” the first of the four comedies, in San Pedro Park.

After 30 years, they've decided to take a break from the rigors of the road, and have made the rights to all of the plays available. That decision came just in time for Playhouse's 100th anniversary season, which opens with “Greater Tuna.”

The play is in very good hands.

The show, well-directed by Anthony Ciaravino, follows a few days in teensy Tuna, Texas, including the shocking death of a judge; an alleged UFO sighting; and a meeting of the censorship-minded Smut Snatchers of the New Order, a censorship group.

The show's gimmick — and one of its many enduring delights — is that all of 18 characters are played by two actors. (Well, 19, if you count the voice of Yippy the dog.) That calls for rapid-fire costume changes, made mostly behind the scenes with the help of four dressers, though there is one nifty moment in which the shift is made on stage.

Bill Gundry has taken on Sears' roles, including the eternally put-upon Bertha Bumiller (as well as her no-good hubby Hank, and her dog-slaying aunt Pearl Burras); the mustachioed the Rev. Spikes, head of the Smut Snatchers; and the aforementioned Yippy.

Gundry and Thornton breathe life into each and every one those characters, capturing the relationships clearly and delivering plenty of laughs.

Alfy Valdez has worked his usual magic with the set, giving a sense of what Tuna must look like. Shelly Chance and Kristi Sharp Vogt did a fine job with the costumes, as well.

Gundry and Thornton are so much fun to watch that it might be nice to see them tackle the rest of the Tuna canon.

“Greater Tuna” can be seen at 8 p.m. Fridays-Saturdays and 2:30 p.m. Sundays through Oct. 28 at the Playhouse, San Pedro Park at Ashby. Tickets cost $15 to $25. Call 210-733-7258 for reservations or visit theplayhousesa.org to buy tickets online.